Question

In an AC. circuit, the current is :

i = `5 sin (100t - pi/2)` amp.

and the a.c. potentiol is:

V = 200 sin (100t) volt.

Then the power consumption is

Options

• 20 watt

• 40 watt

• 1000 watt

• zero watt

Answer 1

zero watt

Explanation:

When we compare the two given equations for V and i we discover that the phase difference between them is `phi = pi/2`.

Average power/ cycle,

P = EvIv cos `phi` = EvIv cos `pi/2` = zero.